Hexagonal Closed-Packed Precipitation Enhancement in a NbTiHfZr Refractory High-Entropy Alloy

Hexagonal Closed-Packed Precipitation Enhancement in a NbTiHfZr Refractory High-Entropy Alloy
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NbTiHfZr 耐火高熵合金中的六方密排沉淀强化

DOI:
10.3390/met9050485
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发表时间:
2019-04
期刊:
影响因子:
2.9
通讯作者:
Zhai Qijie
Zhai Qijie
中科院分区:
材料科学3区
文献类型:
--
作者:
Ma Yueli;Wu Shiwei;Jia Yuefei;Hu Pengfei;Bu Yeqiang;Chen Xiangru;Wang Gang;Liu Jiabin;Wang Hongtao;Zhai Qijie

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制备了一种主相为体心立方结构的NbTiHfZr高熵合金(HEA)。在该合金中观察到一些六方封闭堆积(hcp)相。冷轧后退火的热机械工艺可以控制hcp纳米析出物的体积分数,从而提高强度和延展性。增强效果随hcp纳米沉淀物体积分数的变化而变化。研究结果表明,通过调整变形后热处理方法可以控制HEAs的强度-延性,为利用高温亚稳性设计高强度耐火HEAs (RHEAs)提供了一种不损失延性的新策略。
A NbTiHfZr high-entropy alloy (HEA) with a main phase of body-centered cubic structure is fabricated. Some hexagonal closed-packed (hcp) precipitates are observed in this alloy. A thermal-mechanical process, i.e., cold-rolling followed by annealing, can manipulate the volume fraction of the hcp nano-precipitates that can enhance strength and ductility. The enhancement is tailorable as a function of the volume fraction of the hcp nano-precipitate. The results indicate that the strength-ductility property can be manipulated via adjusting post-deformation heat-treatment methods, which provide a new strategy by utilizing metastability at high-temperature to design high strength refractory HEAs (RHEAs) without lost in ductility.
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